Automatic photo printing machine



July 28, 195 c. T. NATIONS 2,896,505

AUTOMATIC PHOTO PRINTING MACHINE FiledD ec. 21, 1955 6 Sheets-Sheet 1INVENTOR. N Clem 7 NH r/o/vs.

July 28, 1959 c. T. NATIONS 2,896,505

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INVENTOR. 6171?; 7T/V/7 T/ONS.

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July 28, 1959 c. T. NATIONS 2,896,505

AUTOMATIC FHO TO PRINTING MACHINE Filed Dec. 21, 1955 6 Sheets-Sheet 5IN VEN TORB 67751 T NH 7/ 0W5,

July 28, 1959 c. T. NATiONS 2,896,505

AUTOMATIC PHOTO PRINTING MACHINE Filed Dec. 21, 1955 6 Sheets-Sheet eTIMING LMS 2500 INVENTOR. (Ta/PL T NflT/ONS United States PatentAUTOMATIC PHOTO PRINTING MACHINE Carl T. Nations, Orlando, Fla.,assign'or to National Electronics Distributors, Incorporated, Orlando,Fla., a corporation of Florida Application December 21, 1955, Serial No.554,456

12 Claims. (Cl. 88-24) This invention relates to an automatic photoprinting machine and more particularly to a machine for automaticallyprinting photographs from negative films.

It is an object of the present invention to provide such a machine whichis extremely easy to use and highly efficient in its operation.

A further object of this invention is to provide an automatic printingmachine which may be readily used in conjunction with conventional typesof photographic enlargcrs.

A still further object is the provision of a photo printing machinewhich may be adjusted to produce a pre selected number of prints.

A still further object is to provide a mechanism for such machines whichwill accurately feed a preselected length of printing paper for eachprinting operation, whereby all of the prints will be of the same sizeand the printed photographs thereon will be accurately located so that auniform margin will be provided on each print.

Further objects and advantages of this invention will be fullyunderstood from the following description and from the accompanyingdrawings in which:

Fig. 1 is a plan view, partly in section, of an automatic photo printingmachine embodying my present invention.

Fig. 2 is a sectional side view of said machine.

Fig. 3 is a sectional end view on line 3-3 of Fig. 4.

Fig. 4 is a side view of the operating mechanism for said machine.

Fig. 5 is an enlarged sectional front view of the measuring mechanismson line 5-5 of Fig. 6.

Fig. 6 is a sectional side view on line 6-6 of Fig. 7.

Fig. 7 is a view similar to Fig. 5 but showing the clutch in itsdisengaged condition.

Fig. 8 is a side view of the clutch actuating member used in saidmechanism.

Fig. 9 is a plan view of the adjustable border mask provided for saidmachine.

Fig. 10 is a front view of said border mask.

Fig. 11 is a bottom view thereof.

Fig. 12 is a sectional side view on line 12-12 of Fig. 9.

Fig. 13 is a sectional front view on line 13-13 of Fig. 9.

Fig. 14 is an end view of the spool for the unexposed portion of thephotographic paper strip.

Fig. 15 is a sectional side view thereof.

Fig. 16 is a side view, partly in section, of the spool for the exposedportion of the strip.

Fig. 17 is a diagrammatic view of the electrical circuit for controllingthe operation of the machine.

As illustrated in the drawings, my improved automatic photo printingmachine is designed to be used in conjunction with a conventionalphotographic enlarger of the type which includes a base above whichthere is mounted a projector having a lens such as indicated gen-2,896,505 Patented July 28, 1959 may be placed upon the base of such aconventional projector, or the said projector may be placed upon anadjacent supporting surface with the lens 5 disposed above the printingposition in the machine.

My improved printing machine includes a base 6 having thereon acompartment 7 for containing a roll 8 of unexposed photographic printingpaper strip which is mounted in said compartment, as will be hereinaftermore fully described. At the other end of the base 6, there is provideda separate compartment 9 in which the exposed portion of said strip isreceived and rolled therein into a roll 10. Each of the compartments 7and 9 are provided with removable covers 11 and 12, respectively, whichrest in suitable notches that border the said chambers to protect theundeveloped printing paper within the said compartments against exposureto light.

The main operating mechanism of said machine is contained between thesaid chambers 7 and 9 and includes a feed roll 13 which is mounted uponand secured to a drive shaft 14 that is rotatably mounted in suitablebearings in side walls 15 and 16 which extend from a base 17 of theframe for said mechanism. The said feed roll 13 is secured to rotatewith the shaft 14 by means of a pin 18.

A pressure roll 19 is rotatably mounted upon a supporting shaft 20 thatis secured at its opposite ends to a pair of rocker bars 21 and 22 whichare pivotally mounted in side wall portions 23 and 24 that extendupwardly from the walls 15 and 16, respectively; the said rocker barsbeing pivotally secured to said wall portions by screws 25 and 26 whichprovide pivoting studs for said rocker bars.

The rocker bar 22 has an extension 27 which provides a lever handle formanually rocking the said bars 21 and 22 on their pivots and therebyraising the pressure roll 19 to space it from the feed roll 13 when itis desired to thread the machine with the printing paper strip. A hook28 is pivoted-upon the extension 23, by means of a pivoting stud 29, andis adapted to be swung into engagement with the rocker bar 22 forretaining the pressure roll 19 in raised position and out of engagementwith the feed roll 13 while the machine is being threaded.

The drive shaft 14 is driven by means of an electric motor 30 whichrotates a driving worm 31 that drives a worm gear 32 which is rotatableon the said drive shaft 14 and is engageable therewith through a clutchthat includes a clutch disk 33 which is keyed to the drive shaft 14, apair of clutch balls 34-34, and a stationary brake disk 35 which ismounted upon the shaft 14 and secured against rotation thereon by meansof a holding screw 36 extending through a supporting plate 37.

The motor 30 is connected to a pulley 33 by means of a belt 39 androtates the worm 31. This worm rotates the worm gear 32 which in turn isrotated by the balls 34-34, which fit into recesses 40-40 in the disk33. The said balls are forced into said recesses by means of a suitablespring 41 which urges a retaining member 42 against said balls throughthe hub 43 of a rocker lever 44 that is slidable upon the shaft 14. Abraking disk 45 is provided between the disks 33 and 35 and a spring 46presses against the said disk 35 to force the braking disk 45 againstthe disk 33 and thereby provide a braking action tending to stoprotation of the shaft 14 immediately upon the release of the balls 34-34by the member 42, as will be further described.

A paper measuring disk 47 is rotatable upon a sleeve 48 which is mountedon and extends through an eccentric bushing 49 in the wall'24. A drivengear 50 is rotatable on the said sleeve and meshes with a driving gear51 which is carried by a measuring wheel 52 that is rotatable on theshaft 14 and disposed adjacent to the feed roll 13.

The gear 50 is engaged by a friction disk 52 provided between the saidgear and a clutch disk 53 which is secured to a slide shaft 54- thatextends through the sleeve 43. A torsion spring 55 has one end securedto the said clutch disk and its opposite end is anchored to a suitablebracket 56 that is mounted on the Wall-24.

The said slide shaft 54 is in engagement with-a spring bar 57 that isadapted to operate a suitable electric switch, indicated at 58, and alsoto apply tension against the disk 53, through the said shaft 54, forretaining frictional engagement between the gear 50 and the said shaft.

The rocker lever 44 has mounted thereon a plurality of inwardlyprojecting posts which include a post 59 for retaining the balls 34-34in clutching position within the recesses 40-40, and an operating post60 that is engaged by an operating finger 61 for rocking the lever 44against the tension of a spring 62 that urges said bar forcounter-clockwise rotation, as viewed in Fig. 7, and a stop post 63 isprovided on the rocker bar for engaging the edge of the disk 47 to limitthe rotation of said rocker bar and retain it in normal position.

The paper measuring disk 47 is adjusted by means of an adjusting knob 64which may he graduated to cooperate with a pointer 65, for indicatingthe adjustments of the measuring disk for different lengths ofphotographic paper strip, and the said knob is mounted upon a shaft 66that is rotatable in and extends through the walls 23 and 24 and has apinion 67 which meshes with an intermediate gear 68 that meshes with apinion 69 on the said measuring disk. A friction plunger is springpressed against the knob 62 to retain it in adjusted position.

The photographic paper is moved, from between the feed rolls 13 and 19,over an easel which includes a table 71 having a pair of opposed guides72-52 thereon that are adjustable to accommodate photographic strips ofdifferent lengths and to position the said paper to expose a portion ofit in a printing Zone on said table that is directly in alignment withthe lens of the projector. As shown in Figs. 9 to 13, the said guides7272 are slidable upon the table '71 and have end portions 7373 whichextend over and under the opposite edges of the table and are connectedto endless chains 74-74 that extend over sprockets 7575 and retain thesaid guides parallel to each other when adjusted for photographic paperstrips of different widths. The said guides are retained in adjustedposition upon the table 71 by means of a retaining bar 76 that ismounted under the said table and is urged upwardly by a spring 77 intofrictional engagement with a shoe 78 that is secured to one of the saidguides by means of a stud 79' that extends through an elongated slot 80in the said table.

In order to provide for varying the size of the printing zone, or thesize of the exposure area on the said table 71 to accommodatephotographs of different sizes, I provide an adjustable masking devicewhich includes a shield 31 having an accordion type folding portion 82that is secured at one end to an anchoring bar 83 and at its leading endto a masking bar 84. The said anchoring and masking bars are mountedupon a supporting shaft 85 that is secured to the bar 83 and isrotatable in posts 8686 that extend vertically from the table 71. Themasking bar 84 is slidably adjustable on the supporting bar in adjustedposition by means of a plunger 87 which extends through a mounting block88 for the said masking bar and is retained in engagement with the shaft85 by a spring 89. The forward ends of the said bars 83 and 84 and theaccordion type folding portions 82 are slidably connected by means of aconnecting bar 90 which is secured to the bar 83 and slidably extendsthrough a series of notches in the folds of the portion 82 and through apost 91 upon the bar 81. V

The photographic paper strip is moved by thefeed roll through a cuttingdevice which is located adjacent to and following the printing zone andincludes a movable cutting blade 92 that is rotatably mounted betweenupright portions 93-93 of the side walls 23 and 24 and is biased in acounter-clockwise direction, as viewed in Fig. 2, by means of a spring94 that is connected to a crank 95 which is secured to the cuttingblade. The said cutting device is operated by means of a solenoid 96that is connected to the crank 95 by a link 97 for rotating the cuttingblade. A stationary cutting blade 98 is mounted upon the uprightportions 93-93 and positioned to cooperate with the movable blade 92 forsevering the paper upon the operation of the cutting device.

The unexposed roll 8 of the photographic paper is wound upon a core 99and is supported in the machine on a mandrel which includes a pair ofopposed end plugs 100 and 101 that fit into the ends of the core 99. Thesaid plugs are axially adjustable upon the supporting shaft 102 and eachincludes a shell 103 which fits in the end of the core 99 and hasthereon a block 104. A locking plate 105 is slidably secured to saidblock and has a key aperture 106 therein through which the supportingshaft extends. The said shaft has a plurality of annular grooves 106adjacent its opposite ends and the plugs 100 and 101 may be adjustablysecured along said shaft to accommodate rolls of different widths bymeans of said locking plates which are urged to engage with said grooves107 by a suitable spring 108.

The exposed roll 10 of the strip is wound upon a mandrel 109 which issecured to a shaft 110 by means of a nut 111 that is threaded theretofor securing the said mandrel.

The'ends of the shaft extend into notches 112 and 113 and a drivenroller 114 is provided at one end of said shaft rests upon a drivingroller 115 which is mounted on a driving shaft 116 having a sprocketthereon that is driven by a chain 117 which in turn is driven by asprocket 118 on the shaft 14.

The electrical instrumentation and circuit shown in Fig. 17 arecontained within the compartment 119. This includes an electric timingcircuit, indicated at 120 in Fig. 17, for timing the projection of thefilm through the lens 5 of the projector.

In the use of the said machine, the photographic negative which is to beused for producing the required prints is first placed in the enlargerand the lens 5 is adjusted so as to project the negative upon theprinting zone in proper focus. The mask 81 is then adjusted for the sizeof the photographic paper strip which is to be exposed to the projectorand the paper measurement knob is adjusted for the length of paper whichis to be fed through the machine by the rolls 13 and 19. The projectoris normally connected to the electrical circuit which controls theoperation of the machine so that the said circuit also controls theoperation of the projector in synchronism with said machine,

The duration of the exposure may be adjusted in accordance with thequality of the film by adjusting the selectors 121 of the timing circuitand the machine is then ready for operation.

The operation of the machine may be started by simply pressing thestarter switch 122. This will cause energization of the projector whichwill then project the negative upon the portion ofthe strip that isexposed in the printing zone.

' At the expiration of the exposure period, the projector will bede-energized and the motor 30 will be energized. The worm gear 32 willthen be rotated to cause rotation of the drive roll' 13 and movement ofthe photographic strip through the machine. The measuring roll 52 willthen be driven by its contact with the moving photographic strip andthis will cause rotation of the gear 50 which will rotate the shaft 54,through the friction disks 52 and 53, and thereby rotate the finger 61in a counterclcckwisedirection from its normal position against the stopI23'untilit' engages the post 60. The said finger will then rotate thelever 44 in a clockwise direction until 5 the pin 63 will move off theedge of the disk 47, whereupon the torque between the worm wheel 32 andthe clutch disk 33 will force the balls 3434 out of their respectiverecesses 4040 against the tension of the spring 41. This will cause thelever 44 to move the shaft 54 endwise and thereby operate the switch 58and cause de-energization of the motor; whereupon the friction disk 45will instantly stop the rotation of the feed roll 13. It will beunderstood, therefore, that the length of the photographic strip whichis fed through the machine for each cycle of operation is determined bythe adjustment of the disk 44, which adjustment is made by rotation ofthe knob 64. This adjustment determines the distance through which thefinger 61 must travel from its normal position against the stop 123, toits operating position wherein it contacts the stud 60 and moves thestud 63 OK the edge of the disk 61.

The rotation of the disk 47 by the adjusting knob 64 will move the stop123 nearer to, or farther from the stud 60 and this will determine thedistance through which the finger 61 has to be rotated and,consequently, the length of printing paper which must be fed by the feedroll in order to cause rotation of the measuring roll 52 for moving thesaid finger the predetermined distance; thereby controlling the lengthof the printing paper which is fed through the machine for each printingoperation.

The automatic operation of my improved photo printing machine will befurther understood from the diagrammatical illustration of theelectrical circuit shown in Fig. 17 of the drawings and from thefollowing description of the sequential mode of operation.

(1) When the starter switch 122 is pressed, the grid capacitor C-1 willbe discharged.

(2) Discharge of -1 will block this section of the 12AU6 dual triode andthis will remove A.C. from grid of second section of said triode,removing self-rectification and causing conduction of current.

(3) Conduction of said triode section energizes the 10KLM11 relay.

(4) Energization of 10KLM11 relay closes the power circuit and removeslatching voltage to grid of counter cathode.

(5) Power circuit. supplies B+ voltage to timer relay and also energizesKL17A relay.

(6) KL17A relay will then discharge capacitor C-2 into C-l by switchingset of contacts A. Set of contacts B then switches capacitor (3-3 whichhas been charged by B]- circuit to cathode return of the SOBS timertube. This applies a negative voltage to grid of said 50B5 tube causingit to block. Section C of relay KL17A then bridges the cam switch 58 inthe motor circuit and the section D will latch relay KL17A, causing itto stay energized until latching voltage is interrupted.

(7) Blocking of timer tube SOBS de-energizes relay LM5-2500, openingmotor circuit and closing circuit to the enlarger S-a.

(8) When charge of capacitor C-3 delays across resistor divider network,R1 and R-2, the 50135 timer tube conducts and energizes relay LM5-2500.

(9) When relay LM5-2500 is energized, it opens enlarger circuit andcloses motor circuit.

(10) Motor now runs and moves cam switch 58 to run position.

(11) With cam switch in run position, relay KL17A is de-energized.

(12) With KL17A de-energized, A section again charges 0-2, B sectioncauses 0-3 to charge, C section opens bridging circuit to motor and Dsection opens latching circuit to KL17A.

(13) When cam switch 58 is moved to stop position by the motor 30,either cutter solenoid 96 or relay KL17A is energized, depending onposition of cutter selector switches at 124.

(14) If cutter switches are in position for cutting individual prints,the cutter is energized, moving microswitch 125 which is coupled to thecutter.

(15) When the cutter microswitch throws, it energizes KL17A, causingabove sequence to repeat. C-l capacitor of electronic counter is chargedin steps by capacitor C-2. When this charge reaches a certain magnitude,this section of the 12AU6 tube conducts, depending upon the bias settingof the cathode by the divider network which is controlled from the frontof the panel. Each position for the adjustment of this networkrepresents a count of one and is equal to the amount 0-1 -is charged foreach cycle of operation of the machine for producing one photographicprint.

It Will be understood from the above description that the selectorcircuit of my automatic printing machine may be adjusted to repeat theprinting operation for any desired number of prints within the capacityof said selector circuit. Also, the selector switches 124 of the cuttercircuit may be adjusted for cutting 01]. the exposed prints eithersingly or in any desired number as the strip is fed through the cuttermechanism.

When desired, the selector switches may be adjusted so that the switch126 may be used for the manual control of the cutter.

I claim:

1. A photographic printing machine as set forth in claim 11 including anelectric circuit, an electric switch in said circuit for controlling theenergzaton of the motor, and means operable upon disengagement of theclutch for operating said switch to cause de-energization of the motor.

2. The subject matter set forth in claim 11 including an electriccircuit, an electric switch in said circuit for controlling energizationof the motor, and means under the control of the measuring roll forcausing operation of the said switch to de-energize the motorsimultaneously with the disengagement of the clutch.

3. An automatic photographic printing machine including means forsupporting a strip of unexposed photographic paper, an exposure table,guide means on said table for guiding the strip and retaining a portionthereof in exposed position, a feed roll, a pressure roll for pressingthe strip into contact with the feed roll to cause the strip to be movedacross the exposure table, and means for measuring said strip as it is'moved by the feed roll; the said measuring means including a separatemeasuring roll adjacent to the feed roll and cooperating with thepressure roll whereby the said measuring roll is rotated by contact withthe photographic strip independently of the feed roll as said strip ismoved by the feed roll, means for driving the feed roll, a clutchbetween said driving means and feed roll, an operating finger fordisengaging said clutch, a stop for engagement by said finger todetermine its starting position, means for causing rotation of thefinger by the measuring roll for disengaging the clutch, and means foradjusting the said stop to vary the distance between the startingposition of the finger and its clutch disengaging position to therebyvary the length of the strip which is fed by the feed roll during themovement of said finger.

4. An automatic photographic printing machine including means forsupporting a strip of unexposed photographic paper, an exposure table, afeed roll, a pressure roll for pressing the strip into contact with thefeed roll to cause the strip to be moved across the exposure table, adrive shaft for said feed roll, a measuring roll rotatable on said driveshaft and located adjacent to the feed roll and adapted to be rotated bythe strip independently of the feed roll as said strip is fed throughthe machine, an electric circuit, an electric motor in said circuit fordriving said feed roll, a clutch between said motor and feed roll, anelectric switch for controlling energization of the motor, a pinionrotated by said measuring roll, a clutch operating finger, a measuringdisk, a stop on said disk for locating said finger in its startingposition, a gear driven by said pinion for rotating said finger from itsfor rotating said measuring disk to adjust the position of said stop forvarying the distance travelled by the clutch operating finger to causedisengagement of the clutch, and means operable upon the disengagementof the clutch for operating the switch to cause de-energization of themotor. 5. An automatic printing machine including means for supporting aroll of unexposed photographic paper strip, an exposure table, a feedroll for feeding the strip across said table, a motor for driving saidfeed roll, a clutch between said motor and feed roll, a measuringmechanismindependent of the feed roll for measuring portions of saidstrip as it is fed to the exposure table, a cutting mechanism forcutting off exposed portions of said strip, means under the control ofsaid mechanism for causing operation of said clutch to disengage thefeed roll from the motor when the exposed portion of the strip has beenmoved into the cutting mechanism, and means operable by thedisengagement of the clutch to cause operation of the cutting mechanismfor cutting oir" the exposed portion of the strip.

6. An automatic printing machine as set forth in claim including meansoperable by the operation of the cutting mechanism for causing operationof said machine for a successive cycle of operation.

7. In an automatic. printing machine for use with a photographicprojector, means for supporting a strip of photographic printing paper,an exposure table on which a portion of said strip is exposed to theprojector, a feed roll for intermittently moving portions of said stripover said table, an electric circuit having a motor therein for drivingsaid feed roll, a clutch between the motor and the feed roll, a switchin said circuit for controlling energization of the motor, a cuttingmechanism for cutting off exposed portions of said strip, a measuringmechanism including a measuring roll in contact with the said strip androtated solely thereby upon the movement of the strip by the feed roll,means under the control of said measuring roll for causing disengagementof the clutch when a predetermined length of said strip has been movedby the feed roll, adjusting means for varying the operation of saidmeasuring mechanism to vary the length of strip moved by the feed rollduring each cycle of operation of the machine, a cutting mechanism, asolenoid in said circuit for controlling the operation of said cuttingmechanism, means under the control of the measuring mechanism forcausing de-energization of the motor when the clutch is disengaged, andmeans for operating said cutter mechanism to cut oif an exposed portionof the strip upon the clutch being disengaged.

8. In an automatic printing machine of the character described, thecombination of means for supporting a strip of photographic paper inexposed position relatively to a photographic projector, a feed roll formoving said strip across said position, a measuring mechanismindependent of the feed roll for measuring the said strip as it is movedby the feed roll, a cutting mechanism for cutting off exposed portionsof said strip, an electric circuit, a motor for driving said feed roll,a switch in said circuit for controlling energization of the projector,a separate switch for controlling energization of the motor, means forcausing energization of the projector for a predetermined period oftime, means operable upon the expiration of said period of time to causeenergization of the motor and operation of the feed roll for moving thesaid strip, means under the control of the measuring mechanism fordisengaging the feed roll from the motor after a predetermined length ofthe strip has been moved by the feed roll, a cutting mechanism includinga cutter for cutting otf exposed portions of the strip, meansautomatically operable upon disengagement of the feed roll from themotor for operating said cutting mechanism and selectively adjustablemeans in said circuit for causing operation of the cutter for cuttingoff portions of said strip with a selected number of exposures thereon.

9. The subject matter set forth in claim 8 including an electric switchoperable by the operation of the cutting mechanism, and means under thecontrol of said switch for causing operation of said machine for asuccessive cycle of operation.

10. An automatic printing machine including means for supporting a stripof paper, a feed roll for feeding said strip in said machine, a motorfor driving the feed roll, an electric circuit, a switch in said circuitfor controlling the motor, a pressure roll for pressing the strip intocontact with the feed roll, and means for measuring the said strip as itis moved by the feed roll; the said measuring means including ameasuring roll rotatable by frictional engagement with said stripindependently of the feed roll, a measuring mechanism controlled by saidmeasuring roll and operable for operating said switch to de-energize themotor upon the measuring roll having been rotated by a predeterminedlength of said strip, and means for adjusting the said measuringmechanism to render it operable to operate the switch upon the measuringroll having been rotated by different lengths of said strip.

'11. An automatic printing machine for use with a photographicprojector, the said machine including means for supporting a strip ofunexposed photographic paper, a feed roll, a motor for driving said feedroll, a pressure roll for pressing the strip into contact with the feedroll to cause the strip to be moved thereby, and means for controllingthe length of said stripwhich is moved by the feed roll for eachprinting operation of the machine; the said controlling means includinga separate measuring roll located adjacent to the feed roll androtatable only by frictional engagement with the said stripindependently of the feed roll, a clutch between said motor and the feedroll, and means controlled by the measuring roll for releasing the saidclutch upon the measuring roll having been rotated for a predetermineddistance by its contact with thephotographic strip as it is movedthrough the machine by the feed roll.

12. An automatic printing machine including means for supporting a stripof paper, a feed roll for feeding said strip in said machine, a motorfor driving the feed roll, an electric circuit, a switch in said circuitfor controlling the operation of the feed roll, and means for measuringthe said stripas it is moved by the feed roll; the said measuring meansincluding a separate measuring roll rotatable only by engagement withsaid strip independently of the feed roll, a measuring mechanismcontrolled by said measuring roll and operable for operating said switchto terminate the operation of the feed roll upon the measuring rollhaving been rotated by a predetermined length of said strip, and meansfor adjusting the said measuring mechanism to render it operable tooperate the switch upon the measuring roll having been rotated bydifferent lengths of said strip.

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